What is the easiest way to format question on the phone.
Most of the time I use SO on my iPhone and don't find it that easy.
Also do we have any iPhone app for SO ? I couldn't find any in the app store.
As Jeff explains in another answer, the WMD editor is disabled on iOS, so I suspect that there isn't a very easy way to format questions when using those devices.
There are a few iPhone apps that allow you to browse Stack Overflow a bit more conveniently on iOS, but since the API is currently read-only, none of them allow you to post content.